Stoichiometric Calculations. It only looks hard.

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Presentation transcript:

Stoichiometric Calculations

It only looks hard.

Stoichiometric Calculations It only looks hard. Honest.

Stoichiometric Calculations K + H 2 O → KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 1: Balance the equation.

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 1: Balance the equation.

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 2: Ask yourself, “What do you know?”

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 2: Ask yourself, “What do you know?”

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 2: Ask yourself, “What do you know?” I know how many moles of K

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 3: Ask yourself, “What do you need to know?” I know how many moles of K

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 3: Ask yourself, “What do you need to know?” I know how many moles of K

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 3: Ask yourself, “What do you need to know?” I know how many moles of K I need to know moles of H 2

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 4: Use the equation to find the ratio of unknown to known

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 4: Use the equation to find the ratio of unknown to known moles H 2 = 1 moles K 2

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 5: multiply the known number by the ratio

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 5: multiply the known number by the ratio unknown known x known = unknown

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 5: multiply the known number by the ratio mol H 2 mol K x mol K = mol H 2

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 5: multiply the known number by the ratio 1 mol H mol K x 2 mol K =0.02 mol H 2

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 6: the answer should have the same number of significant digits 1 mol H mol K x 2 mol K =0.02 mol H 2

Stoichiometric Calculations 2 K + 2 H 2 O → 2 KOH + H 2 If you use 0.04 mol of K, how much H 2 will you produce? Step 6: the answer should have the same number of significant digits 1 mol H mol K x 2 mol K =0.02 mol H 2

In-class work: a.Solve practice problems 9 & 10 on page 359. b.Choose a chemical equation from chapter 10. Don’t use one that has all the coefficients = 1. c.Write it as a problem similar to problem 9 or 10. d.Trade with someone. You solve theirs and they solve yours.